Safety shutdown device for stationary diesel engines

ABSTRACT

A spring loaded bar normally held in a latched position against the spring bias, the bar being connected to one end of a flexible cable having its other end connected to a conventional internal combustion engine gear rack which is to be actuated upon engine malfunction, a normally open electrical circuit including electromagnetic means operable upon the energization of said circuit to release the latch to permit the bar to move rapidly in the direction of the spring bias, thereby rapidly pulling said cable and its connected rack to effect the engine shut down and to substantially simultaneously open the circuit to the electromagnetic means.

United States Patent DIESEL ENGINES 8 Claims, 9 Drawing Figs.

[52] US. Cl 123/198 DB, 123/196 5 [51 1 Int. Cl ..F02b 77/08, FOlm 1/24[50] Field of Search 123/198, 198 D, 196 S; 184/6 D [56] ReferencesCited UNITED STATES PATENTS 2,112,664 3/1938 Dube ..i23/198 (D2) UX2,201,123 5/1940 Davis 123/198 (D2) 2,645,474 7/1953 Barnes ..123/198(D2) X 2,719,521 10/1955 Kinget al l23/198(D2) 2,854,964 10/1958 Wagner123/198 (D2) FOREIGN PATENTS 668,568 3/1952 Great Britain.v 123/198 (D3)Primary Examiner-Al Lawrence Smith Attorney-Kimmel, Crowell & WeaverABSTRACT: A spring loaded bar normally held in a latched positionagainst the spring bias, the bar being connected to one end of aflexible cable having its other end connected to a conventional internalcombustion engine gear rack which is to be actuated upon enginemalfunction, a normally open electrical circuit includingelectromagnetic means operable upon the energization of said circuit torelease the latch to permit the bar to move rapidly in the direction ofthe spring bias, thereby rapidly pulling said cable and its connectedrack to effect the engine shut down and to substantially simultaneouslyopen the circuit to the electromagnetic means.

PATENTED SEP 7 m1 SHEET 1 OF 2 mvmmn FIG. 7 mm 0. MOFFE rr ATTORNEYSAFETY SHUTDOWN DEVICE FOR STATIONARY DIESEL ENGINES BACKGROUND OF THEINVENTION Pl. Field ofthe Invention This invention relates to safetycontrol means for pulling the oil and/or fuel racks of stationary dieselengines and to thereby effect the engine shutdown before extensivedamage is done to the engine due to some malfunction. In such internalcombustion engines. the usual conditions which require engine shutdownresides in a malfunctioning oil lubrication system or abnormal highoperating temperatures. The present invention pertains to anautomatically operated safety control means in the nature of anaccessory for pulling the gear rack of a stationary diesel-type internalcombustion engine under the above-named conditions of malfunctioningrunning operation. I

2. Description of the Prior Art The prior art is replete with varioustypes of automatically operated safety control means for shutting downstationary internal combustion engines of the diesel-type, the automaticcontrol means of those preceding the applicant in this field beingactuated in response to a low-pressure condition in the lubricating oilsystem and/or engine operation at abnormally high temperatures. Suchexamples may be found in the US. Pat. No. 2,854,964 issued to Harold H.Wagner and No. 2,645,964 to Randolph C. Barnes.

One of the most common expedients for effecting the emergency or safetyshutdown of a stationary diesel engine has been to provide spring meanswhich normally tends to bias the fuel pump rack-bar for movement towardsits off position. Since, however, the usual engine governor alsocontrols the position of the fuel pump rack-bar, this usually preventsthe safety control or shutdown spring means from operating. Barnessolves this problem by introducing a resilient connection between thegovernor and the rack bar. Wagner employs a hydraulic control means.

SUMMARY OF THE INVENTION This invention relates to a safety controlattachment for a stationary or industrial-type diesel engine, andwherein the attachment is directly connected to the engine rack-bar tobe automatically pulled or actuated upon the detection of a malfunctionin the lubricating oil system or the operation of the engine underabnormally high temperature conditions. To this end this inventioncontemplates the provision of a housing suitable for connection on anysupport adjacent the engine as, for example, the supporting base orframe for the engine, and wherein there is provided a reciprocabledrawbar which is manually latched under a spring loaded condition andcable connected with one end of the engine rack-bar. The latch iselectromagnetically released upon the energization of a normally openelectrical circuit, the actuation being responsive to gauge sensedabnonnal conditions of low oil pressure and high operating temperature.The release of the latching means causes the drawbar to move in thedirection of its bias rapidly to pull the gear rack to shut down theengine and, the drawbar in the course of its movement operates switchmeans to deenergize the circuit. This results in fast shutdown timecoupled with but little battery drainage.

Among the further objects of this invention is to provide a safetycontrol device of the type generally described supra and wherein theattachment or accessory is inexpensive to manufacture and to maintain,noncomplex in construction and assembly, and which at all times isrugged and durable in use.

Other and further objects and advantages of the instant invention willbecome more manifest from a consideration of the following specificationwhen read in light of the annexed drawings.

BRIEF DESCRIPTION OF THE DRAWINGS IN THE DRAWINGS FIG. I is aperspective view of the safety control attachment or accessoryconstructed in accordance with this invention,

FIG. I showing the accessory operatively connected via flexible cablemeans with one end ofa conventional rack gear of a diesel engine;

FIG. 2 is a top plan view of the accessory, the cover having beenremoved, and showing the component elements of the device in theirrespective inoperative positions;

FIG. 3 is a view similar to 1, FIG. 3 illustrating the componentelements of the accessory in their respective operative positions;

FIG. 4 is a detail longitudinal cross-sectional view, FIG. 4 being takenon the line 3-3 of FIG. 2, looking in the direction of the arrows;

FIG. 5 is a detail transverse cross-sectional view, FIG. 5 being takensubstantially on the vertical plane of line 5- 5 of FIG. 3, looking inthe direction of the arrows;

FIG. 6 is a fragmentary detail cross-sectional view, FIG. 6 being takensubstantially on the horizontal plane of line 6-6 of FIG. 5, looking inthe direction of the arrows;

FIG. 7 is a fragmentary detail cross-sectional view, FIG. 7 being takensubstantially on the vertical plane of line 7-7 of FIG. 3, looking inthe direction of the arrows;

FIG. 8 is a schematic wiring diagram, this Figure illustrating theelectrical components of the accessory; and

FIG. 9 is a fragmentary detail cross-sectional view taken substantiallyon the horizontal III'llC of line 9--9 of FIG. 4,

- looking in the direction of the arrows.

Referring now more specifically to the drawings, reference numeral 10designates, in general, an accessory in the nature of an overridingsafety control device for pulling the oil, fuel, and/or air supply racksof conventional stationary diesel engines to effect engine shutdown, thedevice being constructed in accordance with the teachings of thisinvention. The device 10 is seen to comprise a substantially hollowelongated rectangular housing 12 which may be formed of a single stripof material bent to provide an elongated substantially rectangular base14 having integrally connected upright laterally spaced and parallelsidewalls I6, 18 and integrally connected upright rectangular end walls20, 22. The housing 12 further includes a continuous inwardly extendingperipheral flange 24 overhanging the base 14, and in which is formed aplurality of tapped openings 26.

The housing 12 further comprises a pair of mounting flanges 28 ofidentical construction, the flanges being connected to the exterior(underside) side of the base 14 in such a manner so as to projectlongitudinally therefrom beyond the adjacent end walls 20, 22. Each ofthe flanges 28 is substantially Z- shaped in transverse cross section,and each includes first and second arms 30, 32 and an interconnectingbight 34. As is seen in FIG. 4, each of the arms 30 is fixedly connectedby conventional means to the underside of the base 14 adjacent each endwall 20, 22, respectively, and in such a manner that the arms 32 projecttherebeyond. Each arm 32 is also formed with a pair of transverselyextending openings 35 to receive conventional fasteners therethrough inorder to effect connection of the accessory or device 10 with the enginebase (not shown) or other suitable support means disposed adjacent thediesel. The housing 12 further includes and is normally closed by anelongated substantially rectangular closure plate 36 which extendsacross the flange 24 and is secured thereon by releasable screwfasteners 38 which are threaded into the tapped openings 26.

Reference numeral 40 denotes an elongated substantially rectangularplatform which is bolted to the base 14 by means of a plurality ofconventional bolts 42 and cooperating nuts 44. Preferably, spacerwashers 46 are carried on the bolts 42 receive for reciprocationtherethrough the opposed ends of a drawbar 60. As is seen in FIGS. 2 to4, inclusive, a substantially rectangular resilient and elastic abutmentmember 62 is disposed in the path of the movement of the drawbar 60 asit moves from its operative position shown in FIG. 3 to its inoperativeposition of FIG. 2. To serve a function to be described, a normallyupright substantially hollow arcuate recess 64 (see FIGS. 4 and 6) isformed in a side 66 of the drawbar intermediate its ends. For purposesto be described,

. the drawbar 60 is also provided with a passage 68 which extendsinwardly from the end 70 and with which a clamp screw 72 is incommunication.

Reference numeral 74 designates a flange which is integrally connectedwith the bight portion 48-and which projects laterally therefrom in thedirection of the sidewall 16. Projecting transversely through the flange74 and fixedly secured thereon are a pair of first and second pivot pins76, 78, respectively, having portions thereof projecting above the upperside of the flange (see FIGS. 2, 3, 4 and At 80 is indicated a firstflat elongated and substantially rectangular lever pivotally mountedadjacent one of its ends on the first pivot pin 76. The other end of thelever 80 extends in the direction of the end wall 82 and is slidablysupported on the bight portion 48, across which it extends, during thecourse of its pivotal movement. Adjacent the outer terminus of theaforementioned other end of the lever 80 there is fixedly connected oneend of an upright cylindrical latch pin 82 which extends across the side66 of the drawbar 60.

Reference numeral 84 denotes, in general, a conventional wire springhaving a helix 86 circumscribing the pin 76. One arm 88 abuts the arm 52of the bracket 50 while its other arm 90 engages the latch pin 82. Theconstruction is such that the latch pin 82 is constantly biased forpivotal movement in a counterclockwise direction, reference being had toFIGS. 2 and 3, to constantly force the latch pin against the drawbarside 66 as the drawbar reciprocates, and for entry into the recess 64when the drawbar 60 is moved from its inoperative to its operativeposition as shown in FIGS. 2 and 3, respectively.

The first lever 80 and the spring 84 are held assembled on the pivot pin76 by means of a conventional split holddown clip 92.

At 94 is indicated a flat substantially L-shaped second lever having afoot portion 96 and a leg section 98. The foot portion 96 is pivotallyconnected on the second pivot pin 78 and is secured thereon by a secondholddown clip 100. The leg section 98 extends across and is slidablysupported on the upper side of the first lever 80 during the pivotalmovement of the second lever. The edge 102 of the leg section 98 isinclined inwardly in the direction of its junction with the foot portion96, and the edge 102 is formed with a transverse inwardly extendingarcuate notch 104 forming an arcuate shoulder 106, the notch 104 beingof such size as to accommodate a portion of the latch pin 82 therein.The inner section of the edge 102 with the shoulder 106 forms a neb 108disposed in the pivotal path of movement of the latch pin 82 and againstwhich the spring arm 90 forces it into tangential engagement in theinoperative form of the invention.

At this point in the description of the invention it is deemed importantto note that both of the levers 80 and 94 extend across thebight portion48 and below the drawbar 60. The drawbar 60 and the lever 94 are soassociated that when the device is in its inoperative position of FIG.2, the plane of the side 66 normally extends across a part of the notch104 in confronting relation relative to the arcuate shoulder 106. Whenthe drawbar 60 is moved to its operative position of FIG; 3, the recess64 is disposed in vertically spaced confronting relationship relative tothe shoulder 106, and since the latch pin 82 is constantly biased formovement against the side The curvilinear plane of the recess 64 extendsless than 180 around the latch pin 82 when the device is in itsoperative position, and this plane continues into the plane of thearcuate shoulder for a total arcuate length of more than 270.

The means for locking the pin in its operative position and foreffecting its release will be described in detail below.

Returning to the description of the components of the device 10,reference numeral 110 indicates an elongated substantially cylindricalrod having a threaded end portion 112 extending through a suitableopening (not shown) formed in the end wall 22. Nuts 114 threaded on thethreaded end portion 112 clamp the rod 110 on the end wall 22 toposition the rod 110 adjacent and parallel to the sidewall 16 above theplatform 14. The rod 110 extends through an opening 116 extending fromedge-to-edge of an elongated substantially rectangular and solid slideblock 118 adjacent an end thereof, the slide block 118 being freelyreciprocable on the rod 110. The other end of the slide block 118projects laterally away from the rod 110 and transversely across thedrawbar 60. This end 119 of the block 118 at the underside 120 thereofis formed with a downwardly opening Lshaped rabbet 12 extending fromedge-to-edge thereof and in which the drawbar 60 is received. Screwmeans 124 connect the slide block 118 on the drawbar 60 centrally of theends of the latter whereby reciprocation of the slide block causesidentical movement of the drawbar.

An elongated helicoidal spring 126 circumscribes the rod 110 over aportion thereof, the spring having an end engaging an edge of the slideblock, and its other end abutting a tension adjusting nut 128 threadedon the rod portion 112 and which is followed by a locknut 130. Thus, theslide block 118 and its connected drawbar 60 are constantly biased formovement from their respective operative positions of FIG. 3 to theirinoperative positions of FIG. 2.

Reference numeral 132 denotes an eye anchor fixedly connected to the endwall 20 and in which is connected one end 134 of a helicoidal spring136. The other end 138 of the spring is connected to one end of anenlarged elongated solid head 140, and fixedly connected to the otherend of the head 140 is one end of an elongated flexible wire 142 havingits other end threaded through an opening 144 which extends through theslide block 118 from edge-to-edge thereof. The aforementioned other endof the wire 142 continues in the direction of the end wall 22 and isslidably received within a fitting 146 to extend laterally therefrom andoutwardly of the housing 12. The fitting 146 is secured on the end wall22 as by means of a locknut 148. The above-mentioned other end of thewire 142 is fixedly connected to the stem 150 of a T-shaped handle 152having a cross head 154. As is seen in FIGS. 2 to 4, inclusive, thespring 136 maintains the wire 142 constantly under tension and to biasconstantly the enlarged head 140 to the left. It will be noted thatnormally, and under inoperative conditions of the device 10, the slideblock 118 is normally spaced from the adjacent end of the head 140, andwhen the slide block 1 18 is in its operative position of FIG. 3, thedistance between the slide block and the head is materially increased.

Reference numeral 156 denotes an electromagnet including its invertedsubstantially U-shaped mounting bracket 158. The bracket 158 includes abight 160 from the opposed ends of which laterally depend the arms 162,164 which engage across the opposed ends of the winding 166 and whichare fixedly secured to the platform 40. The electromagnet 156 alsoincludes a reciprocable armature 168, and the latter, at its outer end,carries a diametrically extending stop pin 170 which projects beyond theopposed sides of the armature 168. The stop pin 170 has a depending end172 which is loosely received within an opening 174 (see FIG. 6) whichis formed in the leg section 98 of the lever 94 adjacent its outerterminal end. A helicoidal spring 176 under compression circumscribesthe armature 168 and has one end thereof abutting against the stop pin170, while its other end abuts against the adjacent arm 162 of thebracket 158. It will thus be understood that the armature 168 isconstantly biased for movement in a direction away from its winding 166.

While the connection between the depending portion 172 of the stop pin170 and the opening 174 formed in the lever 94 is loose, it will beunderstood that the connection is such that as the armature 168 isreciprocated, the lever 94 will pivot about its pivot pin 78.

In FIG. 8 there is illustrated two control circuits for theelectromagnet 156. Each of the control circuits is of the seriestype,and for the purpose of clarity the first of such circuits will bedesignated as the automatic control circuit, while the second onethereof will be referred to as the manual override circuit.

Referring first to the mechanical features of the circuitry, referencenumeral 180 denotes a single-pole, single-throw electrical switch havinga base 182 fixedly secured by conventional fastening means 184 to theplatform 40. A fixed switch contact 186 is fixedly connected on the side188 of the base 182 in confronting relationship relative to a fixedswitch contact 190 supported on an arm 192 of a bracket 194 fixedlyconnected on the side 188. The switch arm 196 includes a pair ofcontacts 198, 200 disposed at one end and at opposite sides thereof, thearrangement being such that with the contact 198 engaging the contact190 in the position shown in FIG. 2, the switch 180 is open, and withthe switch contacts 186 and 200 in engagement, the switch is closed. Theswitch arm 196 is pivotally supported on the arm 202 of an angle bracket204 also fixedly connected on the side 188. The switch arm 196 iseccentrically connected by means of the helicoidal spring 206 to one end208 of a switch actuating lever 212. The other end of the lever 212 iselectrically insulated as at 214. The tension of the spring 206 on theactuating lever 212 is such as to cause the insulated end 214 toconstantly tend to pivot in a clockwise direction (reference being hadto FIGS. 2 and 3) in such a manner as to dispose the insulated end 214in the path of movement of the drawbar 60- to the left. It should herebe noted that the switch 180 is of conventional construction, and of thecomponents thereof described above, the fixed switch contact 190 isnever electrically connected in any circuit, this contact merely servingas stop means to limit the pivotal movement of the switch arm 196 in acounterclockwise direction, that is, in a direction away from the fixedswitch contact 186.

A second switch 216 is mounted on the sidewall 18. The switch 216 is ofthe normally open pushbutton-type and is ac tuated to move to its closedposition by pressing inwardly on the button 218. Also mounted on thesidewall 18 is a pair of binding posts 219, 220. Each binding post isthreaded for connection with conventional securing nuts 222, 224,respectively, to provide connecting means for external leads. Thesebinding posts are electrically insulated from the housing 12.

Referring now specifically to FIG. 8 of the drawings, B designates aconventional source of energy such as, for example, a battery (notshown). One side of the battery is grounded at G in the usual manner asby wire 226 while the other side thereof connects by wire with thebinding post 219.

Reference numeral 230 designates a temperature gauge for sensing a highwater, oil or air temperature condition in the conventional stationarydiesel engine. At 232 is indicated a conventional oil pressure gauge.Such gauges are manufactured by the Frank W. Murphy Manufacturer, 1nc.,3131 South Sheridan, Tulsa, Okla. 74145, and are sold under theregistered trademark SWITCHGAGE. The temperature gauge is identified asthe manufacturers model No. 20-T-2l and the oil pressure gauge ispublicly offered as model No. 20-

P- 27 as identified in the manufacturers bulletin No. RB-6901, datedJan. 1, 1969. Each of these switch gauges includes, as componentelements thereof, single-pole, single-throw switches 234, 236,respectively, which are adapted to close upon the malfunction of thesystem each gauge is monitoring. The gauges 230, 232 are schematicallyshown in FIG. 8, but it will be understood that each gauge is providedwith an indicator arm 238, 240 which sweeps a scale (not shown) on theirrespective gauges whereby the condition of any system being monitoredmay be visually ascertained. Each of the gauges also includes anadjustable fixed switch contact 242, 244 against which the indicatorarms 238, 240 are adapted to close in the presence of a malfunction inany of the monitored systems. Each of the indicator arms 238, 240 aregrounded by wires 246, 248 to their respective grounds G and G which arecommon to the ground G. Wires 250, 252 connect the fixed switch contacts242, 244, respectively, with one end of the wire 254, and the other endof the wire 254 connects with the binding post 220.

The internal wiring of the device 10 comprises connecting one side ofthe coil or winding 166 by wire 254 to the binding post 219 andconnecting the other side of the coil 166 by wire 356 to one side of theswitch 180, the latter being closed when the device 10 is in itsoperative condition. The other side of the switch connects via wire 258to the fixed switch contact 260 of the pushbutton switch 216, and wire262 connects the fixed switch contact 260 with the binding post 220.

Thus it is seen that when either of the indicating arms 234 or 236 closeagainst their fixed switch contacts 242 or 244, respectively, indicatingan engine malfunction, the series circuit is completed to the coil orwinding 166 reading, for the gauge 230, G, wire 226, battery B, wire228, binding post 219, wire 254 to one side of the coil 166, wire 256and across the switch 180, wire 258, wire 262, binding post 220, wire254, wire 250, fixed switch contact 242, indicating arm 238, and wire246 to the ground G common with the ground G.

Should the gauge 232 indicate a malfunction, the wire 250 is read out ofthe above-described circuit and the wire 252 is substituted thereforwhich connects through the fixed switch contact 244, the arm 240, andthe wire 248 to the common ground G Thus, upon the closing of either ofswitches 234 or 236, the coil 166 becomes energized to serve a functionto be described.

The manually operated series circuit includes the ground G, wire 226,battery B, wire 228, binding post 219, wire 254 to one side of the coil166. The wire 258 connects the other side of the coil 166 with the fixedswitch contact of the normally open pushbutton switch 216 which, whenclosed, continues the circuitry from the other side of the switch 216through wire 264 which is grounded on the casing 12 and which is alsothe common ground. Again, the coil or winding 166 becomes energized.

The device 10 is here shown in association with a conventionalstationary diesel-type of internal combustion engine 300 (see FIG. 1)monitored by any one or both of the gauges 230, 232. The engine 300includes a plurality of fuel pumps 302, there being one pump for each ofthe engine cylinders. The pumps are of the type wherein rotation of theplunger effects metering of the fuel to the engine cylinders, and eachpump is shown as having a plunger 304 with a gear 306 fixedly securedthereon and meshing with a rack gear 308 whereby sliding movement of therack gear 308, the several pump plungers 304, will be simultaneouslyangularly adjusted, all in accordance with the conventional practice.The rack gear 308 is normally positioned during engine operation by agovernor (not shown) driven by the usual and conventional means.

One end of a flexible actuating cable 400 is extended into the passage68 formed in the drawbar 60 and is clamped thereon as by the clamp screw72. The other end of the cable 400 extends through a suitable opening(not shown) formed in the end wall 22 and is fixedly connected to oneend of the rack gear 308, the cable being formed of high strength steeland slidably encapsulated in a flexible polyvinyl and steel housing 402.

This completes the description of the device 10 and its connection withthe internal combustion engine 300. The operation of the device 10 isbriefly set forth below.

Referring now specifically to FIG. 2 of the drawings, the componentelements of the device 10 are shown in their inoperative positionsbefore the engine 300 has been started or after one of the gauges 230,232 has sensed a malfunction causing one or the other of the indicatingarms 234, 236 to move to their closed positions across their respectivefixed switch contacts 242, 244. Before the engine 300 is again started,the closed switches 234, 236 must be locked out to keep the automaticcontrol circuit open until the pointers 238, 240 separate from theirrespective fixed switch contacts 242, 244. Any conventional means may beemployed for this purpose, and since the same do not constitute any partof the present invention, such means is indicated as a normally closedsingle-pole, single-throw manually operated switch 500 (see FIG. 8). Theswitch 500 is interposed in the wire 254 between the binding post 220and the connection of the wire 254 with the wires 250 and 252.

Assuming that the switch 500 has been moved to its open condition, thedevice or accessory 10 must be set. To effect the setting, andremembering that the device 10 is in its inoperative position of FIG. 2,the operator will grasp the handle 152 and draw the same to the right.The wire 142 and the head 140 are drawn in the same direction againstthe tension of the spring 136 until the head 140 engages against theadjacent edge of the slide block 118 whereupon the continued exertion offorce on the handle 152 will cause the slide block to move to the rightagainst the tension of the spring 126 and simultaneously move thedrawbar 60 in the same direction. This movement continues in order todraw the recess 64 into substantially confronting relationship relativeto the latch pin 82. As this condition is achieved, the spring arm 90forces the latch pin 82 off the neb 108 and into the recess 64 and notch104. As this movement takes place, the bias of the spring 176 turns thelever 94 in a clockwise direction, reference being had to FIGS. 2 and 3,to cause the shoulder 106 to lock behind the latch pin 82. It shouldalso be noted that as the drawbar 60 moves to the right in the mannerdescribed above, the insulated end 214 of the switch actuator 212escapes from the adjacent end of the drawbar 60 to assume the positionshown in FIG. 3, and, in moving from its position shown in FIG. 2 to itsposition of FIG. 3, the switch actuator 212 causes the switch arm 196 topivot in a counterclockwise direction to close the contact 200 againstthe adjacent fixed switch contact 186, thereby establishing theoperative condition of FIG. 8, it being remembered that the switch 500is open.

With the engine 300 started and achieving its normal operatingcondition, the indicating arms 238, 240 will move away from theirrespective fixed switch contacts 242, 244 to the position shown in FIG.8, and thereafter the switch 500 is closed.

Now should a malfunction in the lubricating or cooling system obtain inthe motor 300, one or the other of the indicating arms 238, 240 willclose across their respective fixed switch contacts 242, 244 to therebyestablish the automatic series circuit described above. With the closingof one of the switches 234, 236, the coil 256 is energized and,referring to FIG. 3, the armature 168 is pulled into the coil 166 of theelectromagnet 156 against the tension of the spring 176. This will drawthe stop pin 170 and its depending portion 172 in the same direction.Since the depending portion 172 is received within the opening 174 ofthe lever 94, the lever 94 will be pivoted in a counterclockwisedirection releasing the shoulder 106 from behind the latch pin 82.Remembering now that the recess 64 extends less than 180 around thelatch pin 82, with the release of the shoulder 106 from behind the latchpin, the tension exerted by the spring 126 on the slide block 118 and,consequently, on the screw 24 and drawbar 60, the latch pin is expressedfrom the recess 64 and pivots in a clockwise direction against the biasof the spring arm 90 whereby the drawbar is free to move from itsposition shown in FIG. 3 to the left to assume its inoperative positionshown in FIG. 2.

The drawbar 60, in moving from its operative position of FIG. 3 to itsinoperative position of FIG. 2, engages the insulated end 214 causingthe switch actuator 212 to pivot and I snap the switch arm 196 from itsoperative position to its inoperative position of FIG. 3. Thisdeenergizes or opens the circuit to thecoil 166.

Nowiasthe drawbar 60 moves from its operative position of FIG. 3 to itsinoperative position of FIG. 2, the connected cable 400 moves therewithto transmit annular movement of the plungers 304 to effect the engineshutdown.

After the malfunctioning system has been rectified, the startingprocedure described above is repeated.

If it be assumed that the engine is running satisfactorily and with thedevice 10 in its cocked or operative position shown in FIG. 3, theoperator may manually effect the engine shutdown by pressing the button218 to close the switch 216. This will again energize the winding 166through the manual control circuit described above causing thecomponents of the device 10 to move from their positions of FIG. 3 totheir positions of FIG. 2 to effect engine shutdown.

Having described and illustrated one embodiment of this invention indetail, it will be understood that the same is offered merely by way ofexample, and that this invention is to be limited only by the scope ofthe appended claims.

What is claimed is:

1. An accessory (10) for connection to the rack gear (308) of aninternal combustion engine(300), said rack gear being movable in onedirection to effect engine shutdown in the event of an enginemalfunction, said accessory comprising:

first means (60, 400) connected with said rack gear (308) for movingsaid rack gear in said one direction to effect said engine shutdown;

second means (110, 118, 124, 126, 128) connected with said first meansfor constantly biasing said first means for movement in said onedirection.;

third means (82, 64, 94) connected with said first means for releasablylatching said first means against said movement;

fourth means (166, 168, 170, 172) for actuating said third means toeffect release of said first means enabling it and said rack gear tomove under said bias in said one direction and to effect said engineshut down;

fifth means (220) for operatively connecting sixth means (234, 236,254), monitoring said engine for malfunction, with said fourth means forautomatically actuating said fourth means upon detection of an enginemalfunction; a source of electrical energy; said fourth means includes anormally closed deenergized first electrical circuit (254, 166, 256,180, 258, 260, 262);

seventh means (219) disposed in said first electrical circuit forconnecting said first electrical circuit with said source of electricalenergy; and wherein said sixth means includes a second normally openelectrical circuit connected in series with said first electricalcircuit, said sixth means closing upon detection of an enginemalfunction and to thereby energize said first electrical circuit.

2. An accessory as defined in claim 1 wherein;

movement of said first means in said one direction actuates an elementof said fourth means for deenergizing said circuits.

3. An accessory as defined in claim 2 wherein:

said element comprises a normally closed first switch con nected in saidfirst circuit and actuated to its open position by movement of saidfirst means in said one direction.

4. An accessory as defined in claim 3 and:

eighth means operatively connected with said fourth means and comprisinga third electric circuit (G, 226, B, 228, 219, 254, 166, 256, 180, 258,260, 216,264, G having a normally open manually operable switchconnected therein movable to its closed position to energize said firstand third circuits to effect the actuation of said fourth means.

5. An accessory as defined in claim 1 and;

a base (14);

and wherein said first means comprises a drawbar (60),

means (50) fixedly connected on said base and supporting said drawbarfor reciprocation thereon, and a flexible cable (400) for connecting oneend of said drawbar with one end of said rack gear.

6 An accessory as defined in claim 1 and;

said third means includes a latch pin (82) mounted on a lever (80) whichis pivotally supported on said base and releasably connected with means(64) on said drawbar to hold said drawbar against movement in said onedirection under the influence of said spring, and means (94) pivotallysupported on said base and including means (106) releasably engagingsaid latch pin and cooperating with said drawbar means for releasablyengaging said latching said pin thereon, and means (174) on saidpivotally supported means for connection with said fourth means.

7. An accessory (10) for connection to the rack gear (308) of aninternal combustion engine (300), said rack gear being movable in onedirection to effect engine shutdown in the event of an enginemalfunction, said accessory comprising;

first means (60, 400) connected with said rack gear (308) for movingsaid rack gear in said one direction to effect said engine shutdown;

second means (110, 118, 124, 126, 128) connected with said first meansfor constantly biasing said first means for movement in said onedirection;

third means (82, 64, 94) connected with said first means for releasablylatching said first means against said movement;

fourth means (166, 168, 170, 172) for actuating said third means toeffect release of said first means enabling it and said rack gear tomove under said bias in said one direction and to effect said engineshutdown;

fifth means (220) for operatively connecting sixth means (234, 236,254), monitoring said engine for malfunction, with said fourth means forautomatically actuating said fourth means upon detection of an enginemalfunction;

a base (14);

and wherein said first means comprises a drawbar (60) means (50) fixedlyconnected on said base and supporting said drawbar for reciprocationthereon, and a flexible cable (400) for connecting one end of saiddrawbar with one end of said rack gear; and wherein said second meanscomprises an elongated rod (110) fixedly supported on said base, a slideblock (118) mounted for reciprocation on said rod, means (124)connecting said drawbar on said slide block for reciprocation therewith,and a spring (126) mounted on said rod and engaging said slide block toconstantly bias said slide block and its connected drawbar for movementin said one direction. 2 8. An accessory (10) for connection to the rackgear (308) of an internal combustion engine (300), said rack gear beingmovable in one direction to effect engine shutdown in the 5 event of anengine malfunction, said accessory comprising:

first means (60, 400) connected with said rack gear (308) for movingsaid rack gear in said one direction to effect said engine shutdown;

second means (110, 118, 124, 126, 128) connected with said first meansconstantly biasing said first means for movement in said one direction;

Third means (82, 64, 94) connected with said first means for releasablylatching said first means against said movement,

fourth means (166, 168, 170, 172) for actuating said third means toeffect release of said first means enabling it and said rack gear tomove under said bias in said one direction and to effect said engineshutdown;

fifth means (220) for operatively connecting sixth means (234, 236, 254)monitoring said engine for malfunction, with said fourth means forautomatically actuating said fourth means upon detection of an enginemalfunction;

said third means includes a latch pin (82) mounted on a lever which ispivotally supported on said base and releasably connected with means(64) on said drawbar to hold said drawbar against movement in said onedirection under the influence of said spring, and means (94) pivotallysup orted on said base and including means (106) releasa ly engagingsaid latch pm and cooperating with said drawbar means for releasablylatching said pin thereon, means (174) on said pivotally supported meansfor connection with said fourth means; and wherein said pivotal supportmeans comprises a lever (94) having a notch (106) formed thereincooperating with said drawbar means (64) to hold said latch pin againstmovement and thus holding said drawbar against movement in said onedirection; and

said fourth means includes an electromagnet having a coil and anarmature mounted for reciprocation therein, a stop pin extendingtransversely across said armature projecting from opposite sidesthereof; resilient means on said armature engaging said stop pin andbiasing said ar mature for movement away from said coil, connecting saidlever to effect pivotal movement thereof upon energization of said coiland to thereby effect release of said latch pin.

1. An accessory (10) for connection to the rack gear (308) of an internal combustion engine(300), said rack gear being movable in one Direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising: first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction.; third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement; fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shut down; fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; a source of electrical energy; said fourth means includes a normally closed deenergized first electrical circuit (254, 166, 256, 180, 258, 260, 262); seventh means (219) disposed in said first electrical circuit for connecting said first electrical circuit with said source of electrical energy; and wherein said sixth means includes a second normally open electrical circuit connected in series with said first electrical circuit, said sixth means closing upon detection of an engine malfunction and to thereby energize said first electrical circuit.
 2. An accessory as defined in claim 1 wherein; movement of said first means in said one direction actuates an element (180) of said fourth means for deenergizing said circuits.
 3. An accessory as defined in claim 2 wherein: said element comprises a normally closed first switch connected in said first circuit and actuated to its open position by movement of said first means in said one direction.
 4. An accessory as defined in claim 3 and: eighth means operatively connected with said fourth means and comprising a third electric circuit (G, 226, B, 228, 219, 254, 166, 256, 180, 258, 260, 216, 264, G3) having a normally open manually operable switch connected therein movable to its closed position to energize said first and third circuits to effect the actuation of said fourth means.
 5. An accessory as defined in claim 1 and; a base (14); and wherein said first means comprises a drawbar (60), means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear. 6 An accessory as defined in claim 1 and; said third means includes a latch pin (82) mounted on a lever (80) which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally supported on said base and including means (106) releasably engaging said latch pin and cooperating with said drawbar means for releasably engaging said latching said pin thereon, and means (174) on said pivotally supported means for connection with said fourth means.
 7. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising; first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction; third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement; fourth means (166, 168, 170, 172) for actuating said third means to effect releaSe of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shutdown; fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; a base (14); and wherein said first means comprises a drawbar (60) means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear; and wherein said second means comprises an elongated rod (110) fixedly supported on said base, a slide block (118) mounted for reciprocation on said rod, means (124) connecting said drawbar on said slide block for reciprocation therewith, and a spring (126) mounted on said rod and engaging said slide block to constantly bias said slide block and its connected drawbar for movement in said one direction.
 8. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising: first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means constantly biasing said first means for movement in said one direction; Third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement. fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shutdown; fifth means (220) for operatively connecting sixth means (234, 236, 254) monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; said third means includes a latch pin (82) mounted on a lever (80) which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally supported on said base and including means (106) releasably engaging said latch pin and cooperating with said drawbar means for releasably latching said pin thereon, means (174) on said pivotally supported means for connection with said fourth means; and wherein said pivotal support means comprises a lever (94) having a notch (106) formed therein cooperating with said drawbar means (64) to hold said latch pin against movement and thus holding said drawbar against movement in said one direction; and said fourth means includes an electromagnet having a coil and an armature mounted for reciprocation therein, a stop pin extending transversely across said armature projecting from opposite sides thereof; resilient means on said armature engaging said stop pin and biasing said armature for movement away from said coil, connecting said lever to effect pivotal movement thereof upon energization of said coil and to thereby effect release of said latch pin. 